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I don't think the 99 - 04 Mustangs had a fuel pump relay per say... These years used a variable speed / variable displacement fuel pump. The pump driver module would increase or decrease the speed of pump depending on fuel demands...

What is the problem you're having?

1994 Cobra Project Envenomation at Great Lakes Dragaway on 8/9/14. New personal best of 10.544 @ 135.84 MPH.

i put the car away for the winter the car ran completely fine never had a problem now it wont start unless i take off the intake tube and squirt a litttle throttleboby cleaner in it then it will start but it runs rough and misfires and when you go to rev it fast it wants to die out . and the check engine light is on .

i changed the fuel filter , iac valve, tps sensor , still having the same problem its about to go to the shop i cant figure it out ..